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Influence of neighboring tree species on AFLP variants of endangered Picea chihuahuana Martínez populations on the Sierra Madre Occidental, North-wastern Mexico

Quiñones-Pérez C. Z., Sáenz-Romero C., Wehenkel C.

Polish Journal of Ecology

2014

Vol. 62, nr 1

55--65

Plant-plant interactions, which are defined as the effect of one plant on another of the same or different species, are inherently local in nature. Plants interact in both positive and negative ways, which are governed by the same underlying ecological dynamic processes. The Mexican endemic Picea chihuahuana Martínez is a largely untouched tree species and it is therefore an excellent model for estimating genetic potential of plant-plant interactions under natural conditions. Because of the scarce research examining plant-plant interactions at the genetic level, we tested the hypothesis that specific genetic variants of P. chihuahuana are associated with (and likely selected by) the presence of particular neighbouring tree species. To explore this question, we applied AFLP genotyping to five P. chihuahuana populations in the State of Durango, North-western Mexico. Under the assumption that the variables genetic variant of P. chihuahuana and nearest-neighbour tree species are directly related to each other, the results show a statistically significant association between such genetic variants – at one AFLP locus in one Picea population – and two nearest-neighbour conifer species (P. chihuahuana Martínez and Pinus arizonica Engelm.). The findings indicate that interactions between genetic variants and species diversity may be crucial in shaping plant communities. However, further studies are required for a better understanding of the possible roles that such associations between genetic variants might play.

Assessment of genetic diversity of Tilia rubra DC. by RAPD analysis in the Hyrcanian forests, north of Iran

Hosseinzadeh Colagar A., Yusefi M., Zarei M., Yousefzadeh H.

Polish Journal of Ecology

2013

Vol. 61, nr 2

341--348

Genetic variability and differentiation of six populations of Tilia rubra from Hyrcanian forests of the north of Iran were analyzed using random ampliﬁed polymorphic DNA (RAPD) markers. Seven primers pairs used to study six populations, in six localities located in at different altitude (250–2500 m a.s.l) but within the distance 50 km, provided 70 reliable bands, of which 29 (41.4%) were polymorphic. The average population diversity using the Shannon’s index (I) was 0.22 and ranged from 0.22 for Bandbon population to 0.08 for the Salahedinkola population. The mean heterozygosity varied from 0.013 to 0.06 within the populations of T. rubra. The AMOVA analysis showed a significant genetic differentiation within populations and 97% of the total variation occurred within populations and only 3% occurred among populations. Cluster analysis using the UPGMA method grouped all individuals into four clusters. The results did not correspond with the populations origin. The low inter-population differentiation and the lack of significant correlation between geographic and genetic distances suggest intensive gene flow among populations of Tilia rubra.